chore(init): scaffold railiance-platform (S3 Platform Services)

Initial repo structure per ADR-003: CLAUDE.md, Makefile, workplans/.
No implementation yet — repo claims its OAS stack layer.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CLAUDE.md

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+# railiance-platform — Claude Code Instructions
+
+**OAS Stack Level:** S3 Platform Services
+**Scope:** Shared services supporting cluster workloads — PostgreSQL HA,
+object storage, secret management, identity, message brokers, caches.
+
+**Pre-condition:** `railiance-cluster` must be converged (k3s running,
+Helm available) before deploying anything from this repo.
+
+## Custodian State Hub Integration
+
+Domain: **railiance** — topic ID: `ca369340-a64e-442e-98f1-a4fa7dc74a38`
+State Hub: http://127.0.0.1:8000
+
+### Session Protocol
+
+**Step 1 — Orient**
+```
+get_domain_summary("railiance")
+```
+
+**Step 2 — Scan workplans**
+```
+ls workplans/   # read all active workplans; note todo/in_progress tasks
+```
+
+**Step 3 — Present brief**
+1. Active workstreams for railiance with `[repo:railiance-platform]` tasks
+2. Pending tasks from local workplans
+3. Goal guidance from summary (needs_workplan / alignment_warnings)
+4. Suggested next action
+
+**During work:** use `record_decision()`, `add_progress_event()`, `resolve_decision()`.
+
+**Session close:** `add_progress_event()` with topic_id and workstream_id.
+
+> Design boundary: hub is read model. Bootstrap tools (create_workstream,
+> create_task) are First Session Protocol only. Work originates as files
+> per ADR-001.
+
+### Repo Boundary Rule (ADR-003)
+
+This repo owns **S3 Platform Services only**. Do not manage:
+- OS-level concerns → `railiance-infra` (S1)
+- Kubernetes runtime concerns → `railiance-cluster` (S2)
+- CI/CD or developer tooling → `railiance-enablement` (S4)
+- Application deployments → `railiance-apps` (S5)
+
+Reference: `railiance-infra/docs/adr/ADR-003-railiance-5repo-stack-architecture.md`
+
+### Workplan Convention (ADR-001)
+
+File location: `workplans/RAIL-PL-WP-NNNN-<slug>.md`
+Prefix: `RAIL-PL`
+
+### SBOM
+
+After updating dependencies:
+```bash
+cd ~/the-custodian/state-hub
+make ingest-sbom REPO=railiance-platform SCAN=1 REPO_PATH=/home/worsch/railiance-platform
+```
+
+### Quick Reference
+
+`~/the-custodian/state-hub/mcp_server/TOOLS.md`